We play a game called Warrock, and he recently started to lag in game and nothing would fix it (FPS woulddrop from 130 to 20-40).
So he updated his processor driver from the AMD website and it helped but his laptop would crash after 20-30 minutes of playing games. He has played games on his laptop for years and the lag problem only recently started coming up. I suggested he just upgrade to a new one but he would like to fix this problem.
Rolling back didn't solve the crash issue and he's saving reformatting as a last resort.
Edit: Rolling back did solve the crashing issue but brought back the lag.
Try uninstalling the new driver completely and going back to a previous driver version and see what that does. My guess is that there is an issue with the driver. If that is a no go, call AMD up and they can help out.